US2453969A - Artificial limb - Google Patents

Artificial limb Download PDF

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Publication number
US2453969A
US2453969A US739109A US73910947A US2453969A US 2453969 A US2453969 A US 2453969A US 739109 A US739109 A US 739109A US 73910947 A US73910947 A US 73910947A US 2453969 A US2453969 A US 2453969A
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portion
foot portion
calf
artificial limb
springs
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US739109A
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Edwin C Carter
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Edwin C Carter
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    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2/60Artificial legs or feet or parts thereof
    • A61F2/66Feet; Ankle joints
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61FFILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F2/00Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
    • A61F2/50Prostheses not implantable in the body
    • A61F2002/5072Prostheses not implantable in the body having spring elements
    • A61F2002/5073Helical springs, e.g. having at least one helical spring

Description

Nov. 16, 1948. E. c. CARTER 2,453,969

ARTIFICIAL LIMB 2 Sheets-Sheet 1 Filed April 3. 1947 .8 9 I r l I Inventor 6 25 Edwin C. Carfer Attqys Nov. 16, 1948. E. c. CARTER ARTIFICIAL LIMB Filed April 5, 1947 2 Sheets-Sheet 2 Inventor Edwin 0. Carter W L i Patented Nov. 16, 1948 UNHTED STATES PATENT OFFICE ARTIFICIAL LIMB Edwin 0. Carter, Rio Grande City, Tex. Application April 3, 1947, Serial No. 739,109

8 Claims.

This invention relates to improvements in artificial limbs.

An object of the invention is to provide an improved artificial limb including a leg supporting calf portion and a foot portion connected together by means of a series of transversely extending spring elements having their opposite ends secured together as separate integral units and attached to said calf portion and foot portion.

Another object of the invention is to provide an improved artificial limb including a hollow leg supporting calf portion and a foot portion connected therewith by means of a series of laterally disposed double coil springs whose protruding ends are welded together at their outermost extremities and are secured to said calf portion and foot portion by means of end encir cling clamping plates and clamping bolts extending therethrough.

A further object of the invention is to provide an improved artificial limb including a hollow leg supporting calf portion and a foot portion connected therewith by means of a series of similarly formed substantially U-shaped bowed springs which extend on a common transverse plane with their opposite extremities welded together and secured to said calf portion and said foot portion by means of encircling clamping plates and assoiated clamping bolts, whereby a flexible and resilient connection will be provided between said calf portion and said foot portion to permit relative forward and backward angular movement between said portions when in use.

Another object of the invention is to provide an improved artificial limb including a hollow leg supporting calf portion and a foot portion connected therewith, with alternately arranged double coil springs having their intermediate connecting portions angled in opposite directions and with their protruding terminal ends welded together and secured to said calf portion and said foot portion, together with means for limiting or snubbing the forward and rearward angular movement between said calf portion and foot portion while walking.

A still further object of the invention is to provide an improved artificial limb which will be highly efficient in operation, and relatively inexpensive to manufacture and produce.

Other objects will appear as the description proceeds.

In the accompanying drawings which form a part of this application,

Figure l is a side elevation, of the artificial limb showing partly in section the use of double coil springs connected between the calf and foot portions;

Figure 2 is a sectional view taken on the line 2--2 of Figure 1;

Figure 3 is a sectional view taken on the line 33 of Figure 1;

Figure 4 is a vertical sectional view taken through the artificial limb showing the use of a series of bowed substantially U-shaped springs connected between the calf portion and the foot portion of the limb;

Figure 5 is a sectional view taken on the line 5-5 of Figure 4, and

Figure 6 is a side elevation of the limb shown in Figure 4, the same being partly broken away and in section to show a slight modification in the spring connection with the foot portion.

Like characters of reference are used throughout the following specification and the accompanying drawings to designate corresponding parts.

In carrying out the invention, there is provided an improved form of artificial limb including a hollow calf portion I having a pillar block 2 in the lower end thereof, and a metallic shell 3 disposed therebelow, being open at its forward end and housing a series of rubber cushioning members 4 with their forward ends being stepped and adapted to be engaged by the coils 5 of the double coil springs 5 and B connected between said calf portion and the foot portion when said limb is used in walking. v

An inverted U-shaped clamping plate 1 is disposed below the shell 3, and cooperates with the U-shaped clamping plate 8 to support and clamp the upper terminal ends 9 of said double coil springs 5 and 6, hich are welded together at it to provide an integral unit. I A rearwardly extending snubber plate H is disposed below the clampin'gplate 8 and has its terminal end extended outwardly to provide a snubber finger I2. I v

The elongated bolts l3 and M will extend through the upper washer l5 and through the vertical apertures It in the filler block 2 and through the shell 3 and rubber cushioning members 4, and finally through the clamping plates 1 and 8 and the snubber plate ll, being secured in the desired adjustment by means of the nuts l1.

The lower series of coils 6 of the double coil springs will have 'rearwardly and horizontally extending protruding ends l8, whose tips will be welded together at l 9, being held in place between the inverted U-shaped clamping plate 20 and the U-shaped clamping plate 2| supported upon the sole plate 22 of the foot portion 23 of the limb by means of the bolts 24 and the cooperating nuts 25.

The sole plate 22 is shaped to the approximate shape of the bottom of a foot, and has an arcuate or U-shaped upwardly extending heel plate 26 attached to its rear end by means of the bolt 2'! and nut 28, the upper end of said heel plate 26 being bent forwardly and downwardly to, form a snubber keeper 29 which will overlie the snubber finger l2 for limiting the forward and rearward rocking movement between the calf portion and e the foot portion of the artificial limb.

The convolutions of the coil springs and 6 will be arranged in staggered relation, with-the portions connecting said spring-s5 and 6 extendin alternately to the right and to the left, whereby a slight sidewise movement between saidcalf. portion and said foot portion will be permitted when-walking.

The form of the artificial limb shown, in Figmics .4; 5 andnfi comprisesahollow calf portion 3! having a filler block 32 in its lower end, said block being formed with the spaced vertical; bore 33.

A washer 34 will be disposed upon the upper sunfiace 01% the block 32:, and. thepair of bolts 35 will extend therethrough and hr i boresfim;

A. pairofi; upper and lower parallel clam-pine plates 36 and 37 having downwardly bent forwardwmds; willbe supported-upon the bolts 3 being secured by the nuts 38;; and EhohQriZ-ontaI unrer ndssboi the bowed substantial y- U-shaped springs. .5. will be clamped therebetween. The re rtips of said ends 39 willbe welded together as at M} to providean integral unit,

A hollowioot-momberflwillbe formed with a ongitu inally xtending channel. '43 in its upner snriace hav n opposi el d p s d vertical s d walls 44, and a downwardly angled bottom 45 whose forwardendlfi is; angled steeper than said portion 45., and terminat sat th openns; 4 formed through the bottom ofthe foot member' Q24. The bottom or lower ends moi the springs 40 W'H'I" have their; rear extremities clamped between the angled bottom 45, and'thefiat clamping late 41!; andsecured; by 'means of the boltor-bolts 50 and nut ornate-5|: disposed through. thepioot member 42; and a hose or heel plate Won-the lower rear end thereof.

An upwardly extend-ingva-rcuate or- -U-.-shaped heel plate 5% willbe secured by the bolt 5|}, and will terminate in the forwar y and down ly extended-snubber keeper 5. to be engaged by the rearward andupwardly extending rubber-finger 55 formed on the end; of." Said clam-pingplate 55'.

' Eromtbe f regoing description, it. will be seen that. whenthe-limb is in use, the springs 40 will be flexed-downwardly -to engage the angled bottom 46 of the foot member 42. The'oppositeside walls- 44 or, the cl'ia-nnel 43.:and therfoot: member lZ-Wiill permit, of aelimitedlateral movement in the calf portion and the-footportion of the limb while, walking, and theisnubber finger 55 and the cooperating; snubber beeper 5.4 willlimit the front and back rocking motion. between said pfififi i.

It will be seen that there has been devised and provided a; hi hly eflieient formoof, artificial limb whichtwilli be relativelyinexpensive to. manufactureiandaproduce While theorefenred embodiment of the instant inventionhas, b enrillu trotedand: escribe t will be understood that it is not intended to limit the scope of the invention thereto, as minor changes in detail of construction may be resorted to without departure from the spirit of the invention.

Having thus described my invention what I claim as new and desire to secure by Letters Patent of the United States is:

1. An artificial limb comprising a hollow leg supportingcalf portion and a foot portion associated therewith, a series of substantially U-shaped laterally disposed springs having rearwardly protruding ends detachably connected between said calf portion and said foot portion, and snubber means for limiting the relative move- 'ment between said portions.

2. An artificial limb comprising a hollow leg supporting calf portion and a foot portion associated therewith, a series of substantially U-shaped laterally disposed springs having rearwardly protruding ends; detachably connected between said calf portion and said foot portion, a snubber keeper on said foot portion, and a cooperating snubber linger on said calf portion adapted. to, limitthe forward and backward motion between said parts.

3. artificial limb comprising a hollow leg sup-porting calf portion and a foot portion associated therewith, a series of substantially Ueshaped laterally disposed springs having rearwardl-y protrudingends detachably connected be,- tweensaid calfportion and said foot portion, snubber means for limitingv the relative movement between; said portions, and cushioning means between said calfi portion and the interconnected vLl-sljiaped laterally disposed springs.

4. An artificial limb comprising a hollow leg supporting calf portion and a foot portion associated therewith, a series of substantially e haped; laterally disposedsprings having-rearwa-rdl-y protruding ends; detachably connected between said calf portion and said foot portion, and movement limiting means disposed at the front and rear of said calf portion.

5.. An artificial, limb. comprising a hollow leg supporting calf portion and a foot portion associated" therewith, a series of substantially u-shaped laterally disposed springs having rearwardly protrudingends detachably connected between said calf portion and said foot portion, rigid snubber means at the rear of said calf portion between the, same and said foot portion, and cushioning means at the front of said calf portion for engagement with said springs for cushioning and limiting the movement between said calf portion and said foot portion.

6. An artificial limb comprising a hollow leg supporting calf portion and a foot portion associated therewith, a series of substantially u-shaped laterally disposed springs having rearwarclly protruding ends detachably connected between said cal-f portion and said foot portion, the opposite ends of said springs being welded together asunits, andclamping means for attaching the same respectively to said calf portion and said foot DOIWQH. I 7. An artificial limb, comprising a hollow leg supporting calf portion, and a foot portion associated therewith, a series of substantially ll-shaped laterally disposed springs having rearwardly protruding ends welded together to form. units, andcooperating interengaging U-shaped clamping plates disposed-about. the, opposite ends of said springs, and secured respectively to. said ,cdi p tl a and t -said mot ortion,

8. An artificial limb comprising a hollow leg supporting calf portion and a hollow foot portion associated therewith, a series of substantially U-shaped double coil springs having rearwardly protruding ends welded together to form units, clamping plates secured to the terminal ends of said springs for securing the same respectively to the calf portion and to the foot portion, snubber means interposed between said calf portion and foot portion, and means engageable by said springs for limiting the forward and backward movement of said foot portion with respect to said calf portion.

EDWIN C. CARTER.

The following references are REFERENCES CITED file of this patent:

UNITED STATES PATENTS Number of record in the Name Date Palmer Feb. 20, 1849 Wilcox Aug. 24, 1858

US739109A 1947-04-03 1947-04-03 Artificial limb Expired - Lifetime US2453969A (en)

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Cited By (63)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556525A (en) * 1949-10-08 1951-06-12 William M Drennon Artificial limb joint
US4328594A (en) * 1980-02-13 1982-05-11 Campbell John W Prosthetic foot
EP0487852A1 (en) * 1990-11-29 1992-06-03 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
US5258039A (en) * 1991-11-15 1993-11-02 The National University Of Singapore Energy storing composite prosthetic foot
US5314499A (en) * 1991-04-04 1994-05-24 Collier Jr Milo S Artificial limb including a shin, ankle and foot
US5376140A (en) * 1992-01-03 1994-12-27 Ryan; Michael W. Prosthetic foot
US5443528A (en) * 1992-11-17 1995-08-22 Allen; Scott Coil spring prosthetic foot
US5458656A (en) * 1991-09-30 1995-10-17 Flex-Foot Energy-storing prosthesis leg pylon vertical shock leg
US5486209A (en) * 1989-04-13 1996-01-23 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US5509938A (en) * 1991-02-28 1996-04-23 Phillips; Van L. Prosthetic foot incorporating adjustable bladder
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US5545234A (en) * 1991-04-04 1996-08-13 Collier, Jr.; Milo S. Lower extremity prosthetic device
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
US5593455A (en) * 1994-05-27 1997-01-14 Phillips; Van L. Plug mounted prosthesis
US5746773A (en) * 1996-03-13 1998-05-05 United States Manufacturing Company C-shaped spring member for prosthetic limbs
US5766265A (en) * 1985-08-01 1998-06-16 Phillips; Van L. Prosthetic foot having curved integral support
US5800568A (en) * 1996-02-16 1998-09-01 Model & Instrument Development Corporation Prosthetic ankle and walking system
US5897594A (en) * 1996-03-04 1999-04-27 Otto Bock Orthopaedische Industrie Besitz-Und Jointless artificial foot
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US6071313A (en) * 1991-02-28 2000-06-06 Phillips; Van L. Split foot prosthesis
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
US6406500B1 (en) 1989-04-13 2002-06-18 Van L. Phillips Foot prosthesis having curved forefoot
US20020087216A1 (en) * 1996-02-16 2002-07-04 Atkinson Stewart L. Prosthetic walking system
US6443995B1 (en) 2000-12-22 2002-09-03 Barry W. Townsend Prosthetic foot
US20030028256A1 (en) * 2001-03-30 2003-02-06 Townsend Barry W. Prosthetic foot with tunable performance
US20030191541A1 (en) * 2000-08-30 2003-10-09 Phillips Van L. Energy storing foot prosthesis with improved plantar flexion
US6663673B2 (en) 2000-06-30 2003-12-16 Roland J. Christensen Prosthetic foot with energy transfer medium including variable viscosity fluid
US20040068327A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with a resilient ankle
US20040068326A1 (en) * 2002-10-08 2004-04-08 Christensen Roland J. Prosthetic foot with oblique attachment
US20040117036A1 (en) * 2001-03-30 2004-06-17 Townsend Barry W Prosthetic foot with tunable performance
US20040186590A1 (en) * 2001-03-30 2004-09-23 Townsend Barry W. Prosthetic foot with tunable performance
US20040186592A1 (en) * 2001-03-30 2004-09-23 Townsend Barry W. Prosthetic foot with tunable performance
US6805717B2 (en) 2002-10-08 2004-10-19 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Manager Of The Roland J. Christensen Family Limited Partnership Energy-storing prosthetic foot with elongated forefoot
US20050033450A1 (en) * 2002-10-08 2005-02-10 Christensen Roland J. Prosthetic foot with a resilient ankle
US6875241B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Variable resistance cell
US20050177250A1 (en) * 2001-03-30 2005-08-11 Townsend Barry W. Prosthetic foot with tunable performance
US20050187640A1 (en) * 2004-02-20 2005-08-25 Roland J. Christensen Prosthetic foot with cam
US6936074B2 (en) 2000-12-22 2005-08-30 Barry W. Townsend Prosthetic foot
US20050203640A1 (en) * 2002-10-08 2005-09-15 Christensen Roland J. Prosthetic foot with a resilient ankle
US6966933B2 (en) 2003-10-21 2005-11-22 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with an adjustable ankle and method
US20050273179A1 (en) * 2001-03-30 2005-12-08 Townsend Barry W Prosthetic foot with tunable performance
US20060178754A1 (en) * 2001-03-30 2006-08-10 Townsend Barry W Prosthetic foot with tunable performance and improved vertical load/shock absorption
US20060185703A1 (en) * 2001-03-30 2006-08-24 Townsend Barry W Mobility assistance apparatus
US7108723B2 (en) 2000-12-22 2006-09-19 Townsend Barry W Prosthetic foot
US20070106397A1 (en) * 2001-03-30 2007-05-10 Townsend Barry W Mobility assistance apparatus
US20070213840A1 (en) * 2003-09-30 2007-09-13 Townsend Barry W Prosthetic Foot with Tunable Performance
US20070213841A1 (en) * 2001-03-30 2007-09-13 Townsend Barry W Prosthetic foot with tunable performance
US20070219643A1 (en) * 2004-04-01 2007-09-20 Townsend Barry W Prosthetic Foot With Tunable Performance
US7341603B2 (en) 2000-06-30 2008-03-11 Applied Composite Technology, Inc. Prosthetic foot with energy transfer including variable orifice
US20080281436A1 (en) * 2001-03-30 2008-11-13 Townsend Barry W Prosthetic Foot with Tunable Performance
US7462201B2 (en) 2003-10-21 2008-12-09 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US7520904B2 (en) 2003-10-21 2009-04-21 Freedom Innovations, Llc Prosthetic foot with an adjustable ankle and method
US7572299B2 (en) 2000-06-30 2009-08-11 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7618464B2 (en) 2006-08-03 2009-11-17 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7727285B2 (en) 2007-01-30 2010-06-01 Freedom Innovations, Llc Prosthetic foot with variable medial/lateral stiffness
US7794506B2 (en) 2007-09-18 2010-09-14 Freedom Innovations, Llc Multi-axial prosthetic ankle
US7824446B2 (en) 2006-12-06 2010-11-02 Freedom Innovations, Llc Prosthetic foot with longer upper forefoot and shorter lower forefoot
US8034121B2 (en) 2008-04-18 2011-10-11 Freedom Innovations, Llc Prosthetic foot with two leaf-springs joined at heel and toe
US8500825B2 (en) 2010-06-29 2013-08-06 Freedom Innovations, Llc Prosthetic foot with floating forefoot keel
US8574314B2 (en) 2003-09-30 2013-11-05 Bioquest Prosthetics Llc Resilient prosthetic and orthotic components which incorporate a plurality of sagittally oriented struts
US10292840B2 (en) * 2017-06-07 2019-05-21 University Of South Florida Biomimetic prosthetic device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6122A (en) * 1849-02-20 Artificial
US21289A (en) * 1858-08-24 Attachment to abtiitcial legs

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6122A (en) * 1849-02-20 Artificial
US21289A (en) * 1858-08-24 Attachment to abtiitcial legs

Cited By (99)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2556525A (en) * 1949-10-08 1951-06-12 William M Drennon Artificial limb joint
US4328594A (en) * 1980-02-13 1982-05-11 Campbell John W Prosthetic foot
US5766265A (en) * 1985-08-01 1998-06-16 Phillips; Van L. Prosthetic foot having curved integral support
US5514186A (en) * 1989-04-13 1996-05-07 Phillips; Van L. Attachment construction for prosthesis
US6527811B1 (en) 1989-04-13 2003-03-04 Van L. Phillips Foot prosthesis with modular foot plate
US5728176A (en) * 1989-04-13 1998-03-17 Flex-Foot, Inc. Attachment construction for prosthesis
US5593457A (en) * 1989-04-13 1997-01-14 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US6406500B1 (en) 1989-04-13 2002-06-18 Van L. Phillips Foot prosthesis having curved forefoot
US5976191A (en) * 1989-04-13 1999-11-02 Phillips; Van L. Foot prosthesis having curved forefoot
US5486209A (en) * 1989-04-13 1996-01-23 Phillips; Van L. Foot prosthesis having auxiliary ankle construction
US5549714A (en) * 1990-09-21 1996-08-27 Phillips; Van L. Symes foot prosthesis
EP0487852A1 (en) * 1990-11-29 1992-06-03 Otto Bock Orthopädische Industrie Besitz- und Verwaltungs-Kommanditgesellschaft Jointless prosthetic foot
DE4038063A1 (en) * 1990-11-29 1992-06-04 Bock Orthopaed Ind Loser joint prosthesis foot
US5509938A (en) * 1991-02-28 1996-04-23 Phillips; Van L. Prosthetic foot incorporating adjustable bladder
US5514185A (en) * 1991-02-28 1996-05-07 Phillips; Van L. Split foot prosthesis
US6071313A (en) * 1991-02-28 2000-06-06 Phillips; Van L. Split foot prosthesis
US5776205A (en) * 1991-02-28 1998-07-07 Phillips; Van L. Split foot prosthesis
US5545234A (en) * 1991-04-04 1996-08-13 Collier, Jr.; Milo S. Lower extremity prosthetic device
US5314499A (en) * 1991-04-04 1994-05-24 Collier Jr Milo S Artificial limb including a shin, ankle and foot
US5458656A (en) * 1991-09-30 1995-10-17 Flex-Foot Energy-storing prosthesis leg pylon vertical shock leg
US5258039A (en) * 1991-11-15 1993-11-02 The National University Of Singapore Energy storing composite prosthetic foot
US5376140A (en) * 1992-01-03 1994-12-27 Ryan; Michael W. Prosthetic foot
US5443528A (en) * 1992-11-17 1995-08-22 Allen; Scott Coil spring prosthetic foot
US5571213A (en) * 1992-11-17 1996-11-05 Allen; Scott Prosthetic foot
US5888238A (en) * 1994-05-27 1999-03-30 Phillips; Van L. Plug mounted prosthesis
US5593455A (en) * 1994-05-27 1997-01-14 Phillips; Van L. Plug mounted prosthesis
US5800568A (en) * 1996-02-16 1998-09-01 Model & Instrument Development Corporation Prosthetic ankle and walking system
US20020087216A1 (en) * 1996-02-16 2002-07-04 Atkinson Stewart L. Prosthetic walking system
US5897594A (en) * 1996-03-04 1999-04-27 Otto Bock Orthopaedische Industrie Besitz-Und Jointless artificial foot
US5746773A (en) * 1996-03-13 1998-05-05 United States Manufacturing Company C-shaped spring member for prosthetic limbs
US6241776B1 (en) 1997-08-04 2001-06-05 Roland Christensen Prosthetic foot with reinforcing member
US5944760A (en) * 1997-08-04 1999-08-31 Roland J. Christensen Family Limited Partnership Prosthetic foot with reinforcing member
US7341603B2 (en) 2000-06-30 2008-03-11 Applied Composite Technology, Inc. Prosthetic foot with energy transfer including variable orifice
US7686848B2 (en) 2000-06-30 2010-03-30 Freedom Innovations, Llc Prosthetic foot with energy transfer
US7572299B2 (en) 2000-06-30 2009-08-11 Freedom Innovations, Llc Prosthetic foot with energy transfer
US6875242B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development, Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Prosthetic foot with energy transfer medium including variable viscosity fluid
US6663673B2 (en) 2000-06-30 2003-12-16 Roland J. Christensen Prosthetic foot with energy transfer medium including variable viscosity fluid
US20040133284A1 (en) * 2000-06-30 2004-07-08 Christensen Roland J. Prosthetic foot with energy transfer medium including variable viscosity fluid
US6875241B2 (en) 2000-06-30 2005-04-05 Roland J. Christensen, As Operating Manager Of Rjc Development Lc, General Partner Of The Roland J. Christensen Family Limited Partnership Variable resistance cell
US7060104B2 (en) 2000-08-30 2006-06-13 Phillips Van L Energy storing foot prosthesis with improved plantar flexion
US20030191541A1 (en) * 2000-08-30 2003-10-09 Phillips Van L. Energy storing foot prosthesis with improved plantar flexion
US6743260B2 (en) 2000-12-22 2004-06-01 Barry W. Townsend Prosthetic foot
US6443995B1 (en) 2000-12-22 2002-09-03 Barry W. Townsend Prosthetic foot
US7108723B2 (en) 2000-12-22 2006-09-19 Townsend Barry W Prosthetic foot
US6936074B2 (en) 2000-12-22 2005-08-30 Barry W. Townsend Prosthetic foot
US7507259B2 (en) * 2001-03-30 2009-03-24 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance
US20080281436A1 (en) * 2001-03-30 2008-11-13 Townsend Barry W Prosthetic Foot with Tunable Performance
US20030191540A1 (en) * 2001-03-30 2003-10-09 Townsend Barry W. Prosthetic foot with tunable performance
US20050016572A1 (en) * 2001-03-30 2005-01-27 Townsend Bary W. Mobility assistance apparatus and method
US7578852B2 (en) 2001-03-30 2009-08-25 Bioquest Prosthetics, Llc Prosthetic foot with tunable performance and improved vertical load/shock absorption
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